"Methionine as a potential key regulator of ageing" is related and may be of interest. Fits in quite well with this study in that they lowered their age according to the marker used with a plant-centred diet; and methionine (which you want lower levels of) is mainly found in animal products

https://llicit.medium.com/a-potential-key-regulator-of-ageing-93ef308a0707